// Copyright 2016 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef DRACO_COMPRESSION_MESH_MESH_EDGEBREAKER_ENCODER_H_
#define DRACO_COMPRESSION_MESH_MESH_EDGEBREAKER_ENCODER_H_

#include <unordered_map>

#include "draco/compression/mesh/mesh_edgebreaker_encoder_impl_interface.h"
#include "draco/compression/mesh/mesh_edgebreaker_shared.h"
#include "draco/compression/mesh/mesh_encoder.h"
#include "draco/mesh/corner_table.h"

namespace draco {

// Class implements the edge breaker geometry compression method as described
// in "3D Compression Made Simple: Edgebreaker on a Corner-Table" by Rossignac
// at al.'01. http://www.cc.gatech.edu/~jarek/papers/CornerTableSMI.pdf
class MeshEdgeBreakerEncoder : public MeshEncoder {
  public:
    MeshEdgeBreakerEncoder();

    const CornerTable *GetCornerTable() const override {
        return impl_->GetCornerTable();
    }

    const MeshAttributeCornerTable *GetAttributeCornerTable(
        int att_id) const override {
        return impl_->GetAttributeCornerTable(att_id);
    }

    const MeshAttributeIndicesEncodingData *GetAttributeEncodingData(
        int att_id) const override {
        return impl_->GetAttributeEncodingData(att_id);
    }

    uint8_t GetEncodingMethod() const override {
        return MESH_EDGEBREAKER_ENCODING;
    }

  protected:
    bool InitializeEncoder() override;
    bool EncodeConnectivity() override;
    bool GenerateAttributesEncoder(int32_t att_id) override;
    bool EncodeAttributesEncoderIdentifier(int32_t att_encoder_id) override;

  private:
    // The actual implementation of the edge breaker method. The implementations
    // are in general specializations of a template class
    // MeshEdgeBreakerEncoderImpl where the template arguments control encoding
    // of the connectivity data. The actual implementation is selected in this
    // class based on the provided encoding options. Because this choice is done
    // in run-time, the actual implementation has to be hidden behind the
    // abstract interface MeshEdgeBreakerEncoderImplInterface.
    std::unique_ptr<MeshEdgeBreakerEncoderImplInterface> impl_;
};

}  // namespace draco

#endif  // DRACO_COMPRESSION_MESH_MESH_EDGEBREAKER_ENCODER_H_
